It seems that the ideal solution would be to push the burden of correctness outward, while still enforcing the correctness checks. How can we do that? Well, with types of course!
（一）船舶开航时不适航，但是在船舶定期保险中被保险人不知道且不应当知道的除外；
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You might notice in the table above, there’s a distinction between “color frames”, “frames”, and “color pictures”. Terminology is a little clunky to the modern eye because we ended up with a system where every frame contains full color information. I’ll create the term “progressive color frame rate”; if you weren’t interlacing, what would be your rate of full-color frames? In NTSC, this is the same thing as the field rate. In field-sequential System 3, this takes three fields.